Apparatus for manufacturing paper-pulp



\ (No Model.)

M. L KEEN. Apparatus for Manufacturing Paper Pulp. No. 240,318. PatentedApriHQ, I881.

\A/I'IJESEEE T n N, PETERS. PHOIO-LITHDGMPHER; WASHINGTON. D. 04

UNITED STATES PATENT OFFICE.

MORRIS L. KEEN, OF EXPERIMENT MILLS, PENNSYLVANIA.

APPARATUS FOR MANUFACTURING PAPER-PULP.

SPECIFICATION forming part of Letters Patent No. 240,318, dated April 19, 1 881.

' Application filed March 19, 1881. (No model.)

To all whom it may concern Be it known that I, MoRRIs L. KEEN, a citizen of the United States,-residing at Experiment Mills, Monroe county, in the State of Pennsylvania, have invented certain new and useful Improvements relating to Apparatus for Manufacturing Paper-Pulp, of which the following is a specification.

The invention may apply to boilers of any form revolving on suitable horizontal trun nions and adapted to receive a liberal quantity of stock, and to expose it to the action of chemicals with heat. I will describe it as applied to a spherical boiler, and prefer that form.

I provide for the admission of steam through the trunnions, and through passages connecting therefrom either outside or inside of the shell leadingfrom the trunnions to points which come alternately at the lowest and highest points in the boiler, as the latter slowly revolves. The opening of the pipes at the latter points is provided with a screen of perforated sheet metal, or other suitable material, of sufficient area to afford a liberal surface for the introduction of the steam in fine jets. I provide means for automatically closing each passage during the period while its screen is above the surface of the material in the boiler, and for holding it open and allowing the steam to be forced into the boiler during a portion or the,

whole of the period while it is immersed.

The valve by which the material is discharged when'sufficiently treated is provided with a delivering-nozzle of a hemispherical form, and I provide a delivering-pipe, having a socket of a corresponding form, with means for bringing it rapidly and tightly into contact when the boileris in the proper position for discharging the stock. The discharge-pipe is connected at the other end to a stand-pipe, in which it is partially cooled by a liberal application of cold water. From this stand-pipe the properly-boiled and disintegrated material is discharged gently into the washing -vat, or other desired portion of the apparatus, forleeching and further treatment. The connection from the stand-pipe to the boiler is made when the delivering-nozzle is in the lowest position, and the contents of the boiler aredischarged rapidly and completely. The full steam-pressure may be maintained in the boiler during the entire period of the discharge, but is preferably shut off toward its close, and the completion of the discharge effected by the expansion. However that may be managed, the man-hole, which serves also as the receiving-nozzle to receive a fresh charge, is placed opposite to the discharge-nozzle, so that while the discharge is being effected preparations may be made for receiving a fresh charge. No movement of the boiler is required after the discharge is completed but the steam-pressure being relieved, the man-hole cover is removed and the proper connection made with little labor orloss of time.

I have applied the invention with a spherical boiler between ten and eleven feet in diameter, treating one and one-half ton of dried stock at a charge, and can complete the emptying in eight minutes.

The accompanying drawings form a part of this specification, and represent what I consider the best means of carrying out the invention.

Figure 1 is a horizontal section through the entire apparatus. Fig. 2 is a corresponding vertical section through the whole. Fig. 3 represents one of the trunnions and the adjacent parts, corresponding to Fig. 2, after the boiler and its cam-gland have performed a quarter revolution. Fig. 4 is aface view of the gland. Its position corresponds to Fig. 3.

The drawings show the novelparts with so much of the ordinary parts as is necessary to indicate theirrelation thereto.

Similarletters of reference indicatelike parts in all the figures.

A is the body of the boiler, which may be of boiler-iron, riveted.

A A are stout trunnions, which may be of cast-iron, supported in fixed hearings in a frame-work. (Not represented.)

A is a gear-wheel, which is engaged by a smaller gear wheel or pinion receiving rotary motion through proper connections from a steam-engine or other motive power, (not represented,) to give the boiler a slow but continuous rotatory motion when in use.

B B are strainers of perforated sheet metal or other suitable material, made somewhat concave in form, but so as to leave a sufficient space under them for the diffusion over the whole surface of steam received through pipes C O, which connect to the respective trunnions A A The connection is shown as outside of the boiler; but Ipropose in some cases to arrange them on the inside of the shell.

D D are pipes controlled by valves d d and communicating with a steam-boiler. (Not represented.) The valves 01 d are puppetvalves, each capable of being easily worked by its stem 0, operated by a lever,F, turning on a center, f, and carrying a roller, F. This roller stands opposite to the edge of the gland G, which revolves with the boiler, and is co:-

centric or cam shaped. At each revolution the full side of'the cam G acts on the roller and opens the valve. The cam-gland, as I will term it, is so adjusted that the period the valve is open will be always while the connected delivery-strainer is in the lower part of its revolution, and is consequently covered by the semi-fluid material contained within the boiler, and through which the steam thus received is caused to percolate in minute globules, heating and agitating the entire mass. During all that period of each revolution when the strainer B is above the surface'the access of steam thereto through the corresponding valve d is shut ofl'; but during a great portion of the time while it is immersed the steam is admitted at full force by the opening of the valve (1. The opposite strainer, B is similarly workedby the openingand closing of the valve d As these strainers are opposite each other the valves 01 01 open alternately, and the flow from the boiler is nearly uniform. I provide any suitable means additional to the percolation of the steam for agitating and thoroughly stirring together the different parts of the contents of the boiler. H II are iron chains secured to eyesin the interior of the boiler, which accomplish this purpose effectually without injuring the thin strainers.

I is a discharge-valve, which may bea globevalve, operated by a hand-wheel, 'i. The delivery-nozzle I of this valve I is hemispherical.

J is a pipe having a hemispherical socket, j, at the receiving end, adapted to fit tightly on the nozzle 1'.

K is a lever, turning on a fulcrum, 7c, and arranged to conveniently throw the dischargepipe J into and out of engagement with the nozzle I, as required. The pipe J is flexibly connected at the other end to a stand-pipe, M, which opens at the bottom into the receiving -tank R, and receives at the top a shower of cold water through the sprinklingplate N, supplied by the pipe 0 from any suitable pump or reservoir, controlled by the valve 0. The material discharged violently through the pipe J, is cooled, and the steam condensed by the shower, and the whole is delivered gently into the washing-tank R. I thus transfer the material rapidly and without labor into the proper open vat for subsequent washing and other ordinary treatment.

A liberal orifice or man-hole, l, of suitable size and form to admit a man to examine and repair theinterior, when necesssary, is stopped by a cover, L, secured by bolts or other suitable means adapted to resist a high pressure. This portion of the apparatus serves as the means for receiving the stock through a funnel, T, supplied from the floor above by hand or by any suitable mechanism. I take care to place the delivery-valve I and the manhole I opposite each other, and so arrange the delivering-pipe J and the receiving-funnel T, that when the boiler is brought to rest after discharging, it will be also in position for receivin g. It follows that the moment the boiler is emptied and the access of steam is shut off by the ordinary stop-valve d, the charging of a fresh supply of stock may be commenced on simply removing the cover L without changing the position of the boiler. Time and labor are saved by this arrangement.

Modifications may be made in the forms and proportions of the details. Parts of the invention may be used without the others.

The anti-friction rollers F may be dispensed with, and the leverF may come in contact directly with their respective cam-glands. The cams may be made independent of the glands and mounted on the fixed ends of the trunnions.

The nozzle I need not be a perfect hemisphere. It may be varied considerably, even to that of aplain cone. Whatever its form, the secket i on the discharge-pipe I should be correspondingly modified so as to form a tight fit.

I can apply cleaning-valves to facilitate cleaning the strainers B B by connecting a hose when required; but I have not found such necessary.

Special or other springs may be attached to the levers F to aid in promptly closing the valves d when released by the cams G; but I believe the pressure of steam generally sufficient.

I can, in small boilers, dispense with the strainer B and the steam-connections there- .for, and cause the boiler to receive steam at only one point in each revolution.

It will be understood that the stock may be introduced either plain or with any required alkalies or other chemicals.

I claim as my invention 1. In a paper-pulp boiler having trunnions on which it is revolved when in use, the steamconnections leading through the trunnions to strainers arranged, as shown, in combination with valves automatically controlling the respective passages by means of eccentrics or cams Gr, rotated with the boiler, substantially as herein specified.

2. In an apparatus for treating paper-stock by steam in a revolving boiler, the devices G, combined and arranged, as shown, so as to per-' form the double functions of glands for the stuffing-boxes and of cams for operating the valves at each revolution, as herein specified.

3. In an apparatus for treating paper-stock, the discharge-valve I, having a nozzle, I, and discharge-pipe J, having a socket, j, in combination with each other and withthe revolving automatically controlling the steam so that it I 5 shall be received only through the lowermost strainer, the provision T L l for receiving the stock, and the provision I I J j M N O O for taking away the pulp under pressure, all arranged to serveas herein specified. 20

In testimony whereof I have hereunto set my hand, at New York city, this 12th day of March, 1881, in the presence of two subscribing witnesses.

' MORRIS "L. KEEN. 'Witnesses:

THOMAS D. STETSON, CHARLES C. STETSON. 

